Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
Physics
Chemistry
Biology
Mathematics
English
Economics
Psychology
Social Studies
Fashion Studies
Legal Studies
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
outputFile() function in fs-extra - NodeJS
Introduction to Async outputFile()
This method is similar to write file of 'fs'. The only difference is it will create the parent directories, if not present. The argument passed should always be a file path, not a buffer or a file descriptor.
Syntax
outputFile(file, data[, options] [, callback])
Parameters
file – String parameter which will contain name and location of the file.
data – The data can hold a string data, buffer stream or a Unit8 string array that is to be stored.
options – The 'outputFile' function supports the following options −
encoding – Default 'utf8'.
mode – Default 0o666
signal – allown aborting an ongoing output file function
callback – This function will give a callback if any error occurs.
Example
Check that fs-extra is installed before proceeding; if not, install fs-exra.
You can use the following command to check whether fs-extra is installed or not.
npm ls fs-extra
Create a asyncOutputFile.js and copy-paste the following code snippet into that file.
Now, run the following command to run the following code snippet.
node asyncOutputFile.js
Code Snippet −
const fs = require('fs-extra')
const file = '/tmp/not/exist/file.txt'
// Writing file with a callback:
fs.outputFile(file, 'Welcome to Tutorials Point!', err => {
console.log(err) // => null
fs.readFile(file, 'utf8', (err, data) => {
if (err) return console.error(err)
console.log(data) // => Welcome to Tutorials Point!
})
})
// Writing file with Promises:
fs.outputFile(file, 'Welcome to Tutorials Point!')
.then(() => fs.readFile(file, 'utf8'))
.then(data => {
console.log(data) // => Welcome to Tutorials Point!
})
.catch(err => {
console.error(err)
})
// Writing file async/await:
async function asyncOutputFileExample (f) {
try {
await fs.outputFile(f, 'Welcome to Tutorials Point!')
const data = await fs.readFile(f, 'utf8')
console.log(data) // => Welcome to Tutorials Point!
} catch (err) {
console.error(err)
}
}
asyncOutputFileExample(file)Output
C:\Users\tutorialsPoint\> node asyncOutputFile.js null Welcome to Tutorials Point! Welcome to Tutorials Point! Welcome to Tutorials Point!
Introduction to outputFileSync()
This method is same as writeFileSync from 'fs'. The only difference is it will create the parent directories, if not present. The argument passed should always be a file path, not a buffer or a file descriptor.
Syntax
outputFileSync(file, data[, options])
Parameters
file – This is a string paramter which will hold the location of the file.
data – The data can hold a string data, buffer stream or a Unit8 string array that is to be stored.
options – The 'outputFile' function supports the following options −
encoding – Default 'utf8'.
mode – Default 0o666
flag – Different flag options for operations on files
Example
Check that fs-extra is installed before proceeding; if not, install fs-exra.
You can use the following command to check whether fs-extra is installed or not.
npm ls fs-extra
Create an outputFileSyncExample.js and copy-paste the following code snippet into that file.
Now, run the following command to run the following code snippet.
node outputFileSyncExample.js
Code Snippet
const fs = require('fs-extra')
const file = '/tmp/this/path/does/not/exist/file.txt'
fs.outputFileSync(file, 'Welcome to Tutorials Point!')
const data = fs.readFileSync(file, 'utf8')
console.log(data) // => Welcome to Tutorials Point!Output
C:\Users\tutorialsPoint\> node outputFileSyncExample.js Welcome to Tutorials Point!
258 Views
